072f:221b — ACR1251U-C
Advanced Card Systems, Ltd
- Vendor ID
- 072f
- Product ID
- 221b
- Combined
- 072f:221b
- Decimal
- 1839:8731
What is this device?
This is the USB identifier for a ACR1251U-C manufactured by Advanced Card Systems, Ltd. The vendor ID 072f is registered to Advanced Card Systems, Ltd with the USB Implementers Forum, and 221b is the product ID that Advanced Card Systems, Ltd assigned to this particular model. When you run lsusb on Linux, this device appears as 072f:221b Advanced Card Systems, Ltd ACR1251U-C.
How to identify it on your system
Linux
$ lsusb Bus 001 Device 004: ID 072f:221b Advanced Card Systems, Ltd ACR1251U-C
You can filter directly with lsusb -d 072f:221b, or get the full descriptor dump with lsusb -v -d 072f:221b. Kernel messages from dmesg show the same pair as idVendor=072f, idProduct=221b.
Windows
In Device Manager, open the device, go to Details → Hardware Ids. This device reports:
USB\VID_072F&PID_221B USB\VID_072F&PID_221B&REV_0100
From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_072F&PID_221B"
macOS
$ system_profiler SPUSBDataType
ACR1251U-C:
Product ID: 0x221b
Vendor ID: 0x072f (Advanced Card Systems, Ltd)Driver help
Having driver issues with this device? Most USB devices are handled by a generic class driver; if yours shows up as an unknown device, confirm the ID above first, then check the manufacturer's downloads page.
Raw usb.ids entry
The exact lines this page is generated from, in the upstream source file:
072f Advanced Card Systems, Ltd 221b ACR1251U-C